如何在 Android 中以编程方式获得 SharedPreferences 的所有键？

小开

SharedPreferences has the method getAll() that returns a Map<String, ?> . From the Map you can retrieve easily the keys with keySet() and the key/value mappings with entrySet():

Map<String, ?> allEntries = prefA.getAll();
for (Map.Entry<String, ?> entry : allEntries.entrySet()) {
Log.d("map values", entry.getKey() + ": " + entry.getValue().toString());
}

小开

Use the getAll() method of android.content.SharedPreferences.

Map<String, ?> map = sharedPreferences.getAll();

小开

What you can do is use getAll() method of SharedPreferences and get all the values in Map and then you can easily iterate through them:

Map<String,?> keys = prefs.getAll();


for(Map.Entry<String,?> entry : keys.entrySet()){
Log.d("map values",entry.getKey() + ": " + entry.getValue().toString());
}

For more, you can check PrefUtil.java's dump() implementation with this link.

小开

Check out the below code for getAll() method

Map<String, ?> prefsMap = prefA.getAll();
for (Map.Entry<String, ?> entry: prefsMap.entrySet()) {
Log.v("SharedPreferences", entry.getKey() + ":" +
entry.getValue().toString());
}

小开

Although @Blackbelt's answer is quite popular here, I think it is not actually targeting the question. (It is not suprising since the question mixes up the terminology of preferences names and keys.) I guess the question is how to find out which shared preferences instances have been created - which can be of interest if the names are created dynamically.

Here are two strategies for that:

create another shared preferences "meta" instance where all created shared prefences instances are registered by adding a key/value pair for it to the meta prefs - with the key being the shared prefences name and the value being any value e.g. true.
```
getSharedPreferences( DYNAMIC_PREFS_NAME, 0 )
.edit().put*(*).apply();
getSharedPreferences( "meta_prefs_index", 0 )
.edit().putBoolean( DYNAMIC_PREFS_NAME, true).apply();
```
To obtain all shared prefences created by you, use the meta prefs and follow the answer of @Blackbelt.
shared preferences have a backup file, which is stored in folder /data/data/YOUR_PACKAGE_NAME/shared_prefs with name YOUR_PREFS_NAME.xml So you can look into that directory for your shared preferences files. But be careful, there might be shared preferences files that were not created by your logic! Therfore I would stick with the first approach.

小开

Kotlin will allow you to get all your SharedPreferences keys with just one line by using Map.

Cheers mate 🎉

val sharedPreferences = context.getSharedPreferences("SHARED_PREFERENCES", Context.MODE_PRIVATE)
val sharedPreferenceIds = sharedPreferences.all.map { it.key } //returns List<String>

小开

After reading @Delacrix response and playing with the Kotlin-way (tested in Kotlin 1.3.11) of retrieving the keys, I found out an even shorter version for getting the keys (or even the values):

val prefsA = context.getSharedPreferences("MyAttack", Context.MODE_PRIVATE)
val prefsAIDs = sharedPreferences.all.keys //returns MutableSet<String>

The same way, you can access only the values via sharedPreferences.all.values (even tho is not what you asked in your question, might be a useful for other readers).